The Tektronix 7B80 is a 400 MHz single time base plug-in without delay function for 7000-series scopes,
typically the 7800 Series, e.g. 7844.
It uses the 155-0126-00 trigger amplifier followed by the 155-0109-01 trigger detector.

Option 2 adds support for X-Y mode via a "Display mode" switch (pictured). When X-Y mode is selected, the X-axis signal is taken from the internal trigger path.

The companion delaying timebase for use in 4-slot mainframes is the 7B85.